Borla ProXS Muffler 400287, 2.25-Inch Dual Inlet and Outlet, Oval Stainless Steel

ProXS Muffler 2.25" Dual Inlet/ 2.25" Dual Outlet, 4" x 9.5" Oval, 19" Long Body, 24" Overall Length. Un-Notched necks are designed for weld in installation. If clamping, use 3" wide band clamps 18003 (clamps not included). This muffler features an internal X-Pipe for increased performance and improved sound. Reversible design for installation flexibility. T-304 Stainless steel for superior corrosion resistance. 100% welded construction for strength. Free Flow design for improved performance. High-temperature continuous-filament fiber (CFF) acoustic material for sound control. Natural mill finish can be brushed or polished prior to installation. Best of all, it's made in the USA and backed by BORLA(r)'s Million-Mile warranty. Just what you'd expect from the world's most experienced (and most winning) exhaust brand. ProXS Muffler 2.25" Dual Inlet/ 2.25" Dual Outlet, 4" x 9.5" Oval, 19" Long Body, 24" Overall Length. Internal X-Pipe. Universal Part. Reversible Design. Million Mile Warranty

• Un-Notched necks are designed for weld in installation. If clamping, use 3" wide band clamps 18003.
• Universal muffler. Reversible design. Dual Inlet, dual outlet. Contains an internal X-Pipe.
• 2.25" Dual Inlet/ 2.25" Dual Outlet, 4" x 9.5" Oval, 19" Long Body, 24" Overall Length
• Alternate muffler with Notched necks is 400492. Use 1" wide band clamps 18322.

The Borla ProXS Muffler 400287 is a universal performance muffler designed for custom exhaust systems and weld-in installations. It features dual 2.25-inch inlets and dual 2.25-inch outlets in a reversible oval configuration, providing flexible positioning during installation. The un-notched necks are intended for welding; if clamping is preferred, Borla recommends using 3-inch-wide band clamps, such as part number 18003, which are sold separately.

An internal X-pipe helps improve exhaust flow, performance, and sound quality, while the free-flow design supports efficient engine breathing. Constructed from T-304 stainless steel, the Borla ProXS offers excellent corrosion resistance and long-term durability. Its fully welded construction provides structural strength, and high-temperature continuous-filament fiber acoustic material helps control sound without restricting exhaust flow. The natural mill finish may be brushed or polished before installation for a customized appearance.

This Borla muffler uses a reversible design for installation flexibility and is manufactured in the USA. It is backed by Borla's Million-Mile Warranty, reflecting the brand's focus on durable, high-performance exhaust components. The muffler is universal and not vehicle-specific, so custom fitment, exhaust routing, and final installation should be confirmed before purchase. For an alternative version with notched necks, see Borla part number 400492, which uses 1-inch-wide band clamps such as part number 18322.

Brief Description: Universal Borla ProXS performance muffler with dual 2.25-inch inlets and outlets, internal X-pipe, reversible design, and T-304 stainless steel construction.

What's Included: One Borla ProXS muffler. Clamps and installation hardware are not included.

Features:

• Internal X-Pipe: Helps improve exhaust flow, engine performance, and exhaust sound quality.
• Reversible Design: Allows flexible orientation during custom exhaust installation.
• T-304 Stainless Steel Construction: Provides strong corrosion resistance and durable service life.
• Free-Flow Performance: Supports efficient exhaust flow while high-temperature acoustic fiber helps control sound.

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: t
Units Per Sku: 1